Veja este artigo: " Windows Home Server: Como atualizar da versão de teste ou beta? ".
Ele contém uma lista das etapas a serem seguidas. Aqui está uma pequena citação do texto:
Upgrading Windows Home Server From a Beta or 120 Day Evaluation Version
The upgrade is actually a server reinstallation as opposed to a new install. This will keep all your existing files and storage pool intact. If this was a new install the drives specified for the storage pool would be formatted and one would lose the data on the drive. Make sure you make note of the users, passwords settings and Windows Live ID you had used in the previous install because you will have to re-enter this information. Also write down the fixed IP address and DNS names you used in the previous install.